package org.apache.maven.toolchain;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.io.File;
import java.io.Reader;

import org.apache.maven.toolchain.model.PersistedToolchains;
import org.apache.maven.toolchain.model.io.xpp3.MavenToolchainsXpp3Reader;
import org.codehaus.plexus.component.annotations.Component;
import org.codehaus.plexus.component.annotations.Requirement;
import org.codehaus.plexus.logging.Logger;
import org.codehaus.plexus.util.IOUtil;
import org.codehaus.plexus.util.ReaderFactory;

/**
 * @author Benjamin Bentmann
 */
@Component(role = ToolchainsBuilder.class,
    hint = "default")
public class DefaultToolchainsBuilder implements ToolchainsBuilder {

  @Requirement
  private Logger logger;

  public PersistedToolchains build(File userToolchainsFile) throws MisconfiguredToolchainException {
    PersistedToolchains toolchains = null;

    if (userToolchainsFile != null && userToolchainsFile.isFile()) {
      Reader in = null;
      try {
        in = ReaderFactory.newXmlReader(userToolchainsFile);
        toolchains = new MavenToolchainsXpp3Reader().read(in);
      } catch (Exception e) {
        throw new MisconfiguredToolchainException(
            "Cannot read toolchains file at " + userToolchainsFile.getAbsolutePath(), e);
      } finally {
        IOUtil.close(in);
      }
    } else if (userToolchainsFile != null) {
      logger.debug("Toolchains configuration was not found at " + userToolchainsFile);
    }

    return toolchains;
  }

}
